If you're a DIY enthusiast looking to upgrade your bathroom, installing a double sink can be a great way to add both functionality and style. However, the plumbing for a double bathroom sink can be a bit more complex than a single sink. In this guide, we'll walk you through everything you need to know to successfully install a double bathroom sink drain line.1. Plumbing a Double Bathroom Sink: What You Need to Know
Before we dive into the specific steps for plumbing a double bathroom sink, let's take a moment to understand the key differences between a double and single sink. The biggest difference is that a double sink requires two drain lines instead of one. This means that you'll need to create a T-junction to connect the two lines to your main drain pipe.2. Double vs. Single: The Differences in Plumbing
Before you start any plumbing project, it's important to make sure you have all the necessary materials. For a double bathroom sink drain line, you'll need:3. Gathering Your Materials
Start by placing the drain assemblies in the bottom of each sink. The assembly typically consists of a drain flange, a gasket, and a locknut. Use plumber's putty around the bottom of the flange to create a seal, then place the assembly in the sink and tighten the locknut from underneath. Repeat this step for the second sink.4. Installing the Drain Assemblies
Next, you'll need to connect the P-traps to each sink's drain assembly. A P-trap is a curved pipe that prevents sewer gases from entering your bathroom. Attach one end of the P-trap to the drain assembly and the other end to the T-junction using plumbing tape to create a secure seal. Repeat this step for the second sink.5. Connecting the P-Traps
With the drain assemblies and P-traps in place, it's time to create the T-junction that will connect the two drain lines. Measure and cut a piece of pipe to fit between the two P-traps, then attach it to the T-junction using plumbing tape. Make sure the T-junction is level and secure.6. Creating the T-Junction
Now that the double sink's drain line is connected, it's time to connect it to the main drain pipe. Measure and cut a piece of pipe to fit between the T-junction and the main drain pipe. Use plumbing tape to create a secure seal and make sure the pipe is level.7. Connecting to the Main Drain Pipe
Before you install the sinks, it's important to test your work for any leaks. Run water through both sinks and check for any leaks at the connections. If you find any, use plumber's tape or silicone caulk to create a better seal.8. Testing for Leaks
With the plumbing work complete, it's time to install the sinks. Apply a bead of silicone caulk around the edge of each sink and carefully place them on top of the vanity. Use a level to make sure they are even and adjust as needed. Once the caulk has dried, you can connect the sink's water supply lines and turn on the water to test for any leaks.9. Installing the Sinks
Here are a few helpful tips and tricks to keep in mind as you tackle your double bathroom sink drain line installation:10. Tips and Tricks for a Successful Double Sink Plumbing Job